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Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the company may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* Checki whether leaf function PAC signing has been requested + in the -mbranch-protect compile-time option. */ +#define LEAF_PROTECT_BIT 2 +#define __HAVE_PAC_LEAF \ + __ARM_FEATURE_PAC_DEFAULT & (1 << LEAF_PROTECT_BIT) + +/* Macro to handle function entry depending on branch-protection + schemes. */ + .macro pacbti_prologue +#if __HAVE_PAC_LEAF +#if __ARM_FEATURE_BTI_DEFAULT + pacbti ip, lr, sp +#else + pac ip, lr, sp +#endif /* __ARM_FEATURE_BTI_DEFAULT */ + .cfi_register 143, 12 + str ip, [sp, #-4]! + .save {ra_auth_code} + .cfi_def_cfa_offset 4 + .cfi_offset 143, -4 +#elif __ARM_FEATURE_BTI_DEFAULT + bti +#endif /* __HAVE_PAC_LEAF */ + .endm + +/* Macro to handle different branch exchange cases depending on + branch-protection schemes. */ + .macro pacbti_epilogue +#if __HAVE_PAC_LEAF + ldr ip, [sp], #4 + .cfi_restore 143 + .cfi_def_cfa_offset 0 + aut ip, lr, sp +#endif /* __HAVE_PAC_LEAF */ + bx lr + .endm -- 2.36.1